Trinity

Writings on the Christian understanding of God as Father, Son, and Holy Spirit — three persons, one God.

Texts in the library

A Confession of the Catholic Faith, Sent to Bishop PaulinusPope Damasus I · Patristic
approx. 10 min read
Confession
A Short and Clear Exposition of the Christian FaithHuldrych Zwingli · Reformed
approx. 120 min read
Confession
Against HermogenesTertullian · Early Church (pre-Nicene)
approx. 105 min read
Treatise
Against MarcionTertullian · Early Church (pre-Nicene)
2 of 5 books
Against Marcion. Book I. ·Against Marcion. Book II.
An Exact Exposition of the Orthodox FaithJohn of Damascus · Eastern Orthodox
4 of 4 books
An Exposition of the Orthodox Faith (Book I) ·An Exposition of the Orthodox Faith (Book II) ·An Exposition of the Orthodox Faith (Book III) ·An Exposition of the Orthodox Faith (Book IV)
Catechetical LecturesCyril of Jerusalem · Patristic
6 of 24 books
Catechetical Lecture V ·Catechetical Lecture VII ·Catechetical Lecture VIII ·Catechetical Lecture IX ·Catechetical Lecture XII ·Procatechesis (Prologue)
Catechetical OrationGregory of Nyssa · Patristic
approx. 160 min read
Catechesis
Commentary on the Gospel of JohnOrigen · Early Church (pre-Nicene)
2 of 4 books
Commentary on John, Book I ·Commentary on John, Book II
ConfessionsAugustine of Hippo · Patristic
1 of 13 books
The Confessions (Book VII)
DemonstrationsAphrahat · Patristic
1 of 8 books
Demonstration 17 (Of Christ the Son of God)
Eranistes (Dialogues)Theodoret of Cyrrhus · Patristic
2 of 3 books
Eranistes, Dialogue I (The Immutable) ·Eranistes, Dialogue II (The Unconfounded)
Great DidacticJohn Amos Comenius · Reformed
1 of 5 books
Chapter I: Man is the Highest, the Most Absolute, and the Most Excellent of Things Created
On First Principles (De Principiis)Origen · Early Church (pre-Nicene)
1 of 4 books
De Principiis (Book I)
On the Holy Spirit (De Spiritu Sancto)Basil the Great · Patristic
approx. 185 min read
Treatise
ProslogionAnselm of Canterbury · Roman Catholic
approx. 50 min read
Meditation
Sermon 21 (On the Feast of the Nativity)Leo the Great · Patristic
approx. 10 min read
Sermon
Sermon on the TrinityJonathan Swift · Anglican
approx. 20 min read
Sermon
Small CatechismMartin Luther · Lutheran
2 of 7 books
Holy Baptism ·The Creed
The Apology of Al Kindy in Reply to the Letter of Abdallah the HâshimiteAl Kindy · Oriental Orthodox
approx. 140 min read
Apology
The Apostles' CreedUnknown (Early Church) · Early Church (pre-Nicene)
approx. 5 min read
Confession
The City of God (De Civitate Dei)Augustine of Hippo · Patristic
1 of 22 books
The City of God, Book XI
The Demonstration of the Apostolic PreachingIrenaeus of Lyons · Early Church (pre-Nicene)
approx. 75 min read
Catechesis
The Golden GroveJeremy Taylor · Anglican
2 of 9 books
A Short Catechism ·An Exposition of the Apostles' Creed
The Martyrdom of PolycarpAnonymous (Church of Smyrna) · Early Church (pre-Nicene)
approx. 20 min read
Hagiography
The Nicene CreedUnknown (Ecumenical) · Ecumenical
approx. 5 min read
Confession
The Refutation of All HeresiesHippolytus of Rome · Early Church (pre-Nicene)
1 of 8 books
The Refutation of All Heresies, Book IX
The Second RhythmEphrem the Syrian · Oriental Orthodox
approx. 10 min read
Hymn
Tractates on the Gospel of JohnAugustine of Hippo · Patristic
28 of 124 books
Tractate 1 (John 1:1-5) ·Tractate 104 (John 17:1) ·Tractate 105 (John 17:1-5) ·Tractate 106 (John 17:6-8) ·Tractate 107 (John 17:9-13) ·Tractate 108 (John 17:14-19) ·Tractate 109 (John 17:20) ·Tractate 110 (John 17:21-23) ·Tractate 111 (John 17:24-26) ·Tractate 2 (John 1:6-14) ·Tractate 3 (John 1:15-18) ·Tractate 4 (John 1:19-33) ·Tractate 5 (John 1:33) ·Tractate 6 (John 1:32-33) ·Tractate 67 (John 14:1-3) ·Tractate 68 (John 14:1-3) ·Tractate 69 (John 14:4-6) ·Tractate 7 (John 1:34-51) ·Tractate 70 (John 14:7-10) ·Tractate 71 (John 14:10-14) ·Tractate 72 (John 14:10-14) ·Tractate 73 (John 14:10-14) ·Tractate 74 (John 14:15-17) ·Tractate 75 (John 14:18-21) ·Tractate 76 (John 14:22-24) ·Tractate 77 (John 14:25-27) ·Tractate 78 (John 14:27-28) ·Tractate 79 (John 14:29-31)